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(Reviewed) $400 2560x1440 IPS no-AG 90hz+ Achieva Shimian QH270 and Catleap Q270 - Page 320

Poll Results: Vote when your Achieva/Catleap monitor comes in.

 
  • 41% (232)
    Achieva QH270
  • 2% (12)
    Achieva QH270 (DOA / didn't recieve)
  • 8% (46)
    Achieva QH270 (Dead pixel(s) / flawed panel)
  • 40% (224)
    Catleap Q270
  • 1% (8)
    Catleap Q270 (DOA / didn't recieve)
  • 5% (33)
    Catleap Q270 (Dead pixel(s) / flawed panel)
555 Total Votes  
post #3191 of 4784
Quote:
Originally Posted by CharlesK View Post

quoted from the same page :
Electricaly not compatible means it needs an active adapter. The same way DP is not electricaly compatible with dual-link DVI and thus needs an active adapter like this :amazon
The problem here is that I don't think active HDMI type A to dvi adapter exists
edit : and type A and type B are not physically compatible (doh.gif), I think that's why type B are not really used.

Hmm, I don't think an Active HDMI-A to DL-DVI adapter is even electrically possible. It would be like trying to convert a SL-DVI port to a DL-DVI port.
post #3192 of 4784
Yes. To both the posts above me.
Why would you want to go HDMI to DVI though, not just DVI to DVI?
---

Can you guys link me your sources on the type a vs type b stuff? I work with TVs and that's hella interesting.
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post #3193 of 4784
Quote:
Originally Posted by Nocturin View Post

Yes. To both the posts above me.
Why would you want to go HDMI to DVI though, not just DVI to DVI?
---
Can you guys link me your sources on the type a vs type b stuff? I work with TVs and that's hella interesting.

Wikipedia smile.gif
post #3194 of 4784
Ok, so it seems that if I want a resolution higher than 1920x1200 through my HDMI connection, I will need a monitor that has a HDMI port. No conversion between HDMI and DVI is possible in resolutions above 1920x1200.

Oh well! Well, at least I didn't buy the monitor to found out later that I was not getting the full resolution.

Thank you all guys for your help. I really appreciate it!
post #3195 of 4784
Quote:
Originally Posted by kevinsbane View Post

Wikipedia smile.gif
Quote:
Originally Posted by Nocturin View Post

Yes. To both the posts above me.
Why would you want to go HDMI to DVI though, not just DVI to DVI?
---
Can you guys link me your sources on the type a vs type b stuff? I work with TVs and that's hella interesting.

I want to convert from HDMI to DVI because my laptop has a VGA and an HDMI port, and these 27" monitors only have DVI connections.
post #3196 of 4784
Quote:
Originally Posted by frogdr View Post

Ok, so it seems that if I want a resolution higher than 1920x1200 through my HDMI connection, I will need a monitor that has a HDMI port. No conversion between HDMI and DVI is possible in resolutions above 1920x1200.
Oh well! Well, at least I didn't buy the monitor to found out later that I was not getting the full resolution.
Thank you all guys for your help. I really appreciate it!

No, you will almost 100% be garunteed to be unable to run one of these at full resolution through HDMI. It's a generalization that will be proved to be wrong in the future, but at the moment, I would say HDMI cannot run these monitors at 1440p, regardless of whatever the specs of HDMI say. No currently available HDMI port is the right kind of HDMI port.

As to your previous post, according to the specs, you will be unable to run this monitor off of your laptop, period.

Now, to temper that stance, at least one user has reported running his VGA capable Shimian/Catleap/dunrememberwhichmodel via the VGA port on his laptop.
post #3197 of 4784
Quote:
Originally Posted by kevinsbane View Post

No, you will almost 100% be garunteed to be unable to run one of these at full resolution through HDMI. It's a generalization that will be proved to be wrong in the future, but at the moment, I would say HDMI cannot run these monitors at 1440p, regardless of whatever the specs of HDMI say. No currently available HDMI port is the right kind of HDMI port.
As to your previous post, according to the specs, you will be unable to run this monitor off of your laptop, period.
Now, to temper that stance, at least one user has reported running his VGA capable Shimian/Catleap/dunrememberwhichmodel via the VGA port on his laptop.

Just out of curiosity, have you been able to test this?

I'm confused because and HDMI(1.4) cable and ports can support a 3D signal, which is about 1/3 more bandwidth when using 3D@720p than no 3D @ 1080p, and the Wikipedia article didn't help much.
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post #3198 of 4784
Quote:
Originally Posted by jta98z View Post

Do all the shimians suffer from the buzzing? I have heard a few people who complained of this which kinda freaked me out. Has anyone gotten one that didn't buzz?

Mine was buzzing, some people reported that too, and other ones that it doesn't.

Either way, there is a fix for that, the most difficult part is disassembling the monitor : link
Quote:
Originally Posted by Lulabby View Post

Hi, so will it even work with 1920*1080 from HDMI to DVI?
Thanks

Someone corrects me if I'm wrong, but the fact that theses monitors don't have a scaler means they need to receive a 2560*1440 signal to work and nothing else, after that, the graphic card is free to scale the resolution to whatever it can as long as the signal emitted is 2560x1440.
Quote:
Originally Posted by kevinsbane View Post

The HDMI port that supports 1440p requires a physically different port. HDMI 1.4 technically supports it, but without the right connector, it simply won't work.
Think of it this way... you need a DL-HDMI port, which is the Type B connector CharlesK referred to. If you can plug in a regular HDMI cable into your HDMI port, you do not have a DL-HDMI port... therefore, even if your video card supports HDMI 1.4, it doesn't have the physical connection required to output a DL-HDMI signal.

No, single link HDMI does support a higher bandwidth than single-link DVI and that's the source of the problem, dvi can't handle the higher frequency of HDMI, so passive adapter (which are only capable of connect single-link to single-link interface) are only capable of the max bandwidth of single-link DVI
Edited by CharlesK - 4/3/12 at 7:12am
post #3199 of 4784
You mean that the standard HDMI port doesn't support resolutions above 1200p?

By the way, there's a similar conversation going on here: http://superuser.com/questions/332099/does-a-hdmi-to-dvi-dual-link-adapter-exist-i-dont-care-about-the-price
post #3200 of 4784
Quote:
Originally Posted by Nocturin View Post

Just out of curiosity, have you been able to test this?
I'm confused because and HDMI(1.4) cable and ports can support a 3D signal, which is about 1/3 more bandwidth when using 3D@720p than no 3D @ 1080p, and the Wikipedia article didn't help much.

From wikipedia,
Quote:
Originally Posted by wikipedia 
Type A
Nineteen pins, with bandwidth to support all SDTV, EDTV and HDTV modes.[4] The plug (male) connector outside dimensions are 13.9 mm × 4.45 mm and the receptacle (female) connector inside dimensions are 14 mm × 4.55 mm. Type A is electrically compatible with single-link DVI-D.

Type B
This connector (21.2 mm × 4.45 mm) has 29 pins and can carry double the video bandwidth of type A, for use with very high-resolution future displays such as WQUXGA (3,840×2,400).[55][56] Type B is electrically compatible with dual-link DVI-D, but has not yet been used in any products.

Bolded and underlined parts are where I took that. The type A and type B connectors are physically different sizes, with the Type A ~50% bigger than the Type A, with the extra lines in the Type B connectors. It seems to me that Type A = SL-DVI, and Type B = DL-DVI.

720p @120hz uses less bandwidth than 1080p @60hz.
720*1280*120 = 110.6 million pixels per second
1080*1920*60 = 124.4 million pixels per second
Edited by kevinsbane - 4/3/12 at 7:03am
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